ABC News’ Rick Klein reports: Former President Bill Clinton is one of the featured speakers at today’s inaugural “Weight of the Nation” conference in Washington, sponsored by the Centers for Disease Control to focus on obesity prevention and control. Clinton’s battles with his own weight, of course, are famous — punctuated by fast-food runs during the early days of his presidency, and the heart bypass operation he needed to undergo in 2004. How to fuel up for an appearance like today’s conference? According to The Washington Post’s “Reliable Source” column (which has the photo to prove it), the former president waited in line Saturday night at Z Burger in Washington’s Tenleytown neighborhood, posing for photos and signing autographs as his take-out order was readied. His order: double burger (hold the mayo), onion rings, French fries, and an apple-pie milkshake. –Rick Klein